New shallow woofer design...

[Wolf]

http://www.soundandvision.com/content/prescient-audios-super-slim-patd12-woofer

Wolf

[winslow]

Re: New shallow woofer design...

I think I just saw some patent information in the newest issue of Voice Coil on this sub...just flipped through and didn't have a chance to read it since the wife cleaned up, and now I can't find the issue.

[Face]

Re: New shallow woofer design...

Looks interesting!

[Adam_G]

Re: New shallow woofer design...

Very cool design. Would make for a great hide-away sub. Wonder how they model.

[Paul Carmody]

Re: New shallow woofer design...

I've been on this board for, I dunno, like 7 years now, and every once in a while, someone comes along and says, "Why don't they just make a woofer with the voice coil going all the way around, just a dome and a surround." And here, finally, someone did it.

[ErinH]

Re: New shallow woofer design...

Very interesting. And since they state "linear excursion", I'm assuming this number has been klippel verified.

Says they're offering it in a loaded enclosure. Hopefully they'll offer the raw driver

[evilskillit]

Re: New shallow woofer design...

Looks pretty neat. If it pans out I wonder how much the tech will cost initially?

[[email protected]]

Re: New shallow woofer design...

The configuration of this driver looks like a Bang & Olufsen patent I saw recently, where a rear surround is mounted between the inner edge of a ring motor structure and the back of a dome diaphragm with a cone-shaped protrusion. However, I doubt B&O will be interested in what this guy is doing unless he attains a large market presence.

You can do lots of things with NdFeB magnets, and moving a very large voice coil is one of them, but this looks like a very expensive design to manufacture. We also saw this exhibit at CES, and the driver was not cheap.

[PWR RYD]

Re: New shallow woofer design...

They were designed and hopefully will be built right here in my little corner of the world.

[ErinH]

Re: New shallow woofer design...

I think I just saw some patent information in the newest issue of Voice Coil on this sub...just flipped through and didn't have a chance to read it since the wife cleaned up, and now I can't find the issue.

you are indeed correct, Jason. January 2014 version of Voice Coil Mag has the patent info written up there. If I remember to when I get home, I'll post the info.

[winslow]

Re: New shallow woofer design...

http://www.faqs.org/patents/app/20130266173

[tomzarbo]

Re: New shallow woofer design...

I don't know much about voice coil construction, so I may demonstrate my ignorance with this question, but wouldn't that much of a voice coil tend to increase impedance quite a bit? There has to be a large amount of wire in that coil even if it's just one layer. I figure around 30" for just one wrap of wire...

Unless they had, maybe two or four separate coils wired in series/parallel etc. to control impedance?

Again, probably just showing how much I don't know.

Super-cool idea, though. With huge magnets and depth with most heavy-hitting subs, this design seems to reduce cabinet volume considerably.

TomZ

[audioengr]

Re: New shallow woofer design...

I don't know much about voice coil construction, so I may demonstrate my ignorance with this question, but wouldn't that much of a voice coil tend to increase impedance quite a bit? There has to be a large amount of wire in that coil even if it's just one layer. I figure around 30" for just one wrap of wire...

Unless they had, maybe two or four separate coils wired in series/parallel etc. to control impedance?

Again, probably just showing how much I don't know.

Super-cool idea, though. With huge magnets and depth with most heavy-hitting subs, this design seems to reduce cabinet volume considerably.

TomZ

Just decrease the wire gauge. The big benefit is higher power handling.

[ErinH]

Re: New shallow woofer design...

in the car audio world, shallow subs are not new. in fact, SI has a new version of theirs coming out soon. 3.4" depth, and somewhere in the neighborhood of 15mm linear excursion, IIRC.
JL Audio also has a few varieties but the 13tw5v2 is 2.625" deep and klippel verified at about 11mm. Alpine, Kenwood, Pioneer, Earthquake, etc, etc, all have shallow subs.

That said, this one is about 1/2" shallower than any of the others I know of and if the linear throw value is legit, that's pretty hefty.

[jsr]

Re: New shallow woofer design...

I like shallow subs, but most have an Fs that's pretty high. As ErinH mentioned, shallows are common in the car audio world, but I've yet found one that I could use with an alignment to provide more low end extension without EQing the hell out of it in a decent/small-ish box.
Hopefully this new one will be the first to be capable of that. But then I probably couldn't afford it.